<!DOCTYPE html>
<html lang="zh-CN">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
    <title>dropdown btn</title>

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    <link href="../css/bootstrap.min.css" rel="stylesheet">

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  </head>
  <body>
    <div class="dropdown">
        <button class="btn btn-default btn-primary dropdown-toggle" type="button" id="dorpdownMenu1" data-toggle="dropdown">
            Dropdown <span class="caret"></span>
        </button>
        <ul class="dropdown-menu" role="menu" aria-labelledby="dorpdownMenu1">
          <li role="presentation" class="dropdown-header">header</li>
          <li role="presentation"><a role="menuitem" tabindex="-1" href="#">Action</a></li>
          <li role="presentation"><a role="menuitem" tabindex="-1" href="#">Another action</a></li>
           <li role="separator" class="divider"></li>
          <li role="presentation"><a role="menuitem" tabindex="-1" href="#">Something else here</a></li>
          <li role="presentation"><a role="menuitem" tabindex="-1" href="#">others</a></li>
        </ul>
    </div>
    <br /><br /><br /><br /><br /><br />

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    <script src="../jquery.min.js"></script>
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  </body>
</html>